5.7-rc0: kswapd eats cpu during a disk test?!

[Pavel Machek]

Hi!

This is simple cat /dev/sda > /dev/zero... on thinkpad x60 (x86-32),
with spinning rust.

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+  COMMAND
   1000 root      20   0       0      0      0 R  53.3  0.0  57:34.93  kswapd0
  27897 root      20   0    6976    580    536 R  44.5  0.0   1:44.53  cat

It keeps both CPUs busy... and I don't think that's right.

-- 
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